Leave M25 at junction 20, Kings Langley follow the signs for Aylesbury A41. Leave the bypass at the Hemel Hempstead exit and follow to Town Centre. Eventually arriving at the famous funny roundabout. From there you follow the signs for the M1. At the top of the hill straight over the roundabout (or you can stay in the left lane and by pass it) at the next roundabout straight ahead (2nd exit) then take the 3rd turning on the left into Leverstock Green Road, at double mini roundabouts turn left into Vauxhall Road at roundabout turn right into ground.